Significant energy transfer from CpcG2‐phycobilisomes to photosystem I in the cyanobacterium Synechococcus sp. PCC 7002 in the absence of ApcD‐dependent state transitions

摘要

Hemidiscoidalphycobilisomes(PBS),themajorlightharvestingcomplexesofphotosynthesisinmostcyanobacteria,arecomposedofrodsandcores,whicharelinkedbythelinkerCpcG1(LRC).AnothertypeofPBS,CpcG2‐PBSexitsandtheirfunctioninenergytransferhasnotbeenfullyunderstood.Wemeasuredgrowthrates,absorptioncross‐sectionsandquantumefficiencyofphotosystemIinmutantstrainsofSynechococcusPCCsp.7002lackingthelinkerCpcG2.OurresultsshowedthatenergytransferfromCpcG2‐PBStoPSIintheabsenceofstatetransitionscouldbesignificantunderPBS‐absorbinglightandenergytransferfromtwotypesofPBSisindependenttoeachother.EvidencealsosuggestedthatCpcG2anchorstheCpcG2‐PBStothylakoidmembranes...